Field-induced modulation of the conductance, thermoelectric power, and magnetization in ballistic coupled double quantum wires under a tilted magnetic field

The effect of a tilted magnetic field B on the modulation of tunneling, the ballistic conductance, the ballistic electron-diffusion thermoelectric power, and the orbital magnetization is studied for tunnel-coupled ballistic double quantum wires. The magnetic field has a component B_y along the wires and a component B_x perpendicular to the plane that contains both wires. We find that B_y alters the B_x dependence of the electronic and transport properties drastically in the presence of interwire tunneling. The latter has been studied extensively in the literatures in the absence of B_y and is known to show many interesting transport properties. The presence of B_y causes the effective tunneling integral to oscillate continuously with sign changes and decay eventually for large B_y. The B_y-induced interwire tunnel coupling between different sublevels and the quenching of it under a large B_y were both observed experimentally by Thomas et al. Phys. Rev. B 59 12252 (1999).